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Contributing to Eclipse OMR

Thanks for your interest in this project.

We welcome and enourage all kinds of contribution to the project, not only code. This includes bug reports, user experience feedback, assistance in reproducing issues and more.

This project uses GitHub Issues to track ongoing development, discuss project plans, and keep track of bugs. Be sure to search for existing issues before you create another one.

Visit our Issues page on GitHub to search and submit

Submitting a contribution

You can propose contributions by sending pull requests through GitHub. Following these guidelines will help us to merge your pull requests smoothly:

  1. If you're not sure your contribution would be accepted, and want to validate your approach or idea before writing code, feel free to open an issue. However, not every feature or fix needs an issue. If the problem and fix are cleanly connected, and you have the fix in hand, feel free to just submit a pull request.

  2. Your pull request is an opportunity to explain both what changes you'd like pulled in, but also why you'd like them added. Providing clarity on why you want changes makes it easier to accept, and provides valuable context to review.

  3. Please read carefully and adhere to the legal considerations and copyright/license requirements outlined below.

  4. Follow the coding style and format of the code you are modifying (see the coding standards). The code base is yet to be unified in style however, so if the file you are editing seems to have a diffferent style, defer to the style of the file as you found it.

  5. Follow the commit guidelines found below.

  6. We encourage you to open a pull request early, and mark it as "Work In Progress" (prefix the PR title with WIP). This allows feedback to start early, and helps create a better end product. Committers will wait until after you've removed the WIP prefix to merge your changes.

Commit Guidelines

The first line describes the change made. It is written in the imperative mood, and should say what happens when the patch is applied. Keep it short and simple. The first line should be less than 70 characters, where reasonable, and should be written in sentence case preferably not ending in a period. Leave a blank line between the first line and the message body.

The body should be wrapped at 72 characters, where reasonable.

Include as much information in your commit as possible. You may want to include designs and rationale, examples and code, or issues and next steps. Prefer copying resources into the body of the commit over providing external links. Structure large commit messages with headers, references etc. Remember however that the commit message is always going to be rendered in plain text.

Please add [skip ci] to the commit message when the change doesn't require a compilation, such as documentation only changes, to avoid unnecessarily wasting the project's build resources.

Use the commit footer to place commit metadata. The footer is the last block of contiguous text in the message. It is separated from the body by one or more blank lines, and as such cannot contain any blank lines. Lines in the footer are of the form:

Key: Value

When a commit has related issues or commits, explain the relation in the message body. You should also leave an Issue tag in the footer. For example:

Correct race in frobnicator 

This patch eliminates the race condition in issue #1234.

Issue: #1234

Sign off on your commit in the footer. By doing this, you assert original authorship of the commit and that you are permitted to contribute it. This can be automatically added to your commit by passing -s to git commit, or by hand adding the following line to the footer of the commit.

Signed-off-by: Full Name <email>

Remember, if a blank line is found anywhere after the Signed-off-by line, the Signed-off-by: will be considered outside of the footer, and will fail the automated Signed-off-by validation.

It is important that you read and understand the legal considerations found below when signing off or contributing any commit.

Example commits

Here is an example of a good commit:

Update and expand the commit guidelines

Elaborate on the style guidelines for commit messages. These new
style guidelines reflect the conversation found in #124.

The guidelines are changed to:
- Provide guidance on how to write a good first line.
- Elaborate on formatting requirements.
- Relax the advice on using issues for nontrivial commits.
- Move issue references from the first line to the message footer.
- Encourage contributors to put more information into the commit
  message.

Issue: #124
Signed-off-by: Robert Young <rwy0717@gmail.com>

The first line is meaningful and imperative. The body contains enough information that the reader understands the why and how of the commit, and its relation to any issues. The issue is properly tagged and the commit is signed off.

The following is a bad commit:

FIX #124: Changing a couple random things in CONTRIBUTING.md.
Also, there are some bug fixes in the thread library.

The commit rolls unrelated changes together in a very bad way. There is not enough information for the commit message to be useful. The first line is not meaningful or imperative. The message is not formatted correctly, the issue is improperly referenced, and the commit is not signed off by the author.

Other resources for writing good commits

Install a git commit message hook script to validate local commits

We have a script that attempts to enforce some of these commit guidelines. You can install it by following instructions similar to the ones below.

cd omr_repo_dir
cp scripts/commit-msg .git/hooks
chmod +x .git/hooks/commit-msg

If the hook declines your commit, the message will remain in omr_repo_dir/.git/COMMIT_EDITMSG.

Be sure to update your version of the script occasionally as it may evolve as our commit guidelines evolve.

Legal considerations

Please read the Eclipse Foundation policy on accepting contributions via Git.

Your contribution cannot be accepted unless you have a signed ECA - Eclipse Foundation Contributor Agreement in place. If you have an active signed Eclipse CLA (the CLA was updated by the Eclipse Foundation to become the ECA in August 2016), then that signed CLA is sufficient. You will have to sign the ECA once your CLA expires.

Here is the checklist for contributions to be acceptable:

  1. Create an account at Eclipse.
  2. Add your GitHub user name in your account settings.
  3. Log into the project's portal and sign the "Eclipse ECA".
  4. Ensure that you sign-off your Git commits.
  5. Ensure that you use the same email address as your Eclipse account in commits.
  6. Include the appropriate copyright notice and license at the top of each file.

Your signing of the ECA will be verified by a webservice called 'ip-validation' that checks the email address that signed-off on your commits has signed the ECA. Note: This service is case-sensitive, so ensure the email that signed the ECA and that signed-off on your commits is the same, down to the case.

Copyright Notice and Licensing Requirements

It is the responsibility of each contributor to obtain legal advice, and to ensure that their contributions fulfill the legal requirements of their organization. This document is not legal advice.

OMR is dual-licensed under the Eclipse Public License 2.0 and the Apache License v2.0. Any previously unlicensed contribution should be released under the same license.

  • If you wish to contribute code under a different license, you must consult with a committer before contributing.
  • For any scenario not covered by this document, please discuss the copyright notice and licensing requirements with a committer before contributing.

The template for the copyright notice and dual-license is as follows:

/*******************************************************************************
 *  Copyright (c) 2017, 2017 ${author} and others
 *  
 *  This program and the accompanying materials are made available under
 *  the terms of the Eclipse Public License 2.0 which accompanies this
 *  distribution and is available at https://www.eclipse.org/legal/epl-2.0/
 *  or the Apache License, Version 2.0 which accompanies this distribution and
 *  is available at https://www.apache.org/licenses/LICENSE-2.0.
 *       
 *  This Source Code may also be made available under the following
 *  Secondary Licenses when the conditions for such availability set
 *  forth in the Eclipse Public License, v. 2.0 are satisfied: GNU
 *  General Public License, version 2 with the GNU Classpath
 *  Exception [1] and GNU General Public License, version 2 with the
 *  OpenJDK Assembly Exception [2].
 *     
 *  [1] https://www.gnu.org/software/classpath/license.html
 *  [2] http://openjdk.java.net/legal/assembly-exception.html
 *  
 *  SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
 *******************************************************************************/